Refractor and filter choicesPosted By Michael Frias |
1) Does it matter what kind of refractor (apochromatic vs achromatic) that is used for h-alpha solar viewing?
2) It seems the big differences between the Coronado filter models are the angstrom rating and the aperture of the filters. What is the advantage of the larger aperture filters?
2) It seems the big differences between the Coronado filter models are the angstrom rating and the aperture of the filters. What is the advantage of the larger aperture filters?